Umiński, Paweł. “The Importance of the Financial Sector and Its Impact on Economic System in the United States in Years 1970–2010”. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy 6, no. 3 (June 20, 2011): 59–70. Accessed July 7, 2025. https://apcz.umk.pl/EQUIL/article/view/EQUIL2011.020.